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rle append and freq boiler

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This commit is contained in:
Muaz Ahmad 2023-11-28 16:24:47 +05:00
parent dcd6a4c298
commit 6cfed66432
1 changed files with 28 additions and 6 deletions
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34
src/output.zig
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@ -16,17 +16,17 @@ const HuffCode = struct {
const Scan = struct {
arena: std.heap.ArenaAllocator,
diffs: [3]i16,
dc_diffs: [3]i16,
rles: [3]RLE_Seq,
freqs: [4][]u32,
huffs: [4]Huffman,
const Self = @This();
fn init(alloc_: std.mem.Allocator) !Self {
var arena = std.heap.ArenaAllocator.init(alloc_);
fn init(alloc_root: std.mem.Allocator) !Self {
var arena = std.heap.ArenaAllocator.init(alloc_root);
var alloc = arena.allocator();
return Self{ .arena = arena, .diffs = [3]i16{ 0, 0, 0 }, .rles = [3]RLE_Seq{
return Self{ .arena = arena, .dc_diffs = [3]i16{ 0, 0, 0 }, .rles = [3]RLE_Seq{
RLE_Seq.init(alloc),
RLE_Seq.init(alloc),
RLE_Seq.init(alloc),
@ -40,14 +40,36 @@ const Scan = struct {
fn deinit(self: *Self) void {
self.arena.deinit();
}
fn do_rle_freq_pass(self: *Self, buff: *const util.Buffers) !void {
const h = buff.Y_quant.len;
const w = buff.Y_quant[0].len;
for (0..h) |x| {
for (0..w) |y| {
for (0..4) |Y_sub_i| {
try parse_block(&buff.Y_quant[x][y][Y_sub_i], &self.dc_diffs[0], &self.rles[0], self.freqs[0], self.freqs[1]);
}
try parse_block(&buff.U_quant[x][y], &self.dc_diffs[1], &self.rles[1], self.freqs[2], self.freqs[3]);
try parse_block(&buff.V_quant[x][y], &self.dc_diffs[2], &self.rles[2], self.freqs[2], self.freqs[3]);
}
}
}
};
fn parse_block(block: *util.BlockQuantized, dc_diff: *i16, dc_rle: *RLE_Seq, dc_freqs: []u32, ac_freqs: []u32) !void {
_ = ac_freqs;
_ = dc_freqs;
_ = dc_rle;
_ = dc_diff;
_ = block;
}
pub fn generate_jpg(buff: util.Buffers, alloc: std.mem.Allocator) !void {
_ = buff;
var scan_data = try Scan.init(alloc);
defer scan_data.deinit();
scan_data.do_rle_freq_pass(buff);
try scan_data.do_rle_freq_pass(&buff);
// rle, huffman pass
// file headers